Help!?! Yeast Infection or Rough Intercorse?

I know this can't be truley diagnosed w/o a doctor. Although me and my boyfriend had protected sex (while on my period)  2 days ago. After going for about an hour I got really dry, but we kept going cause he hadn't finished. The same night my labias were bright pink and swollen. They didn't hurt unless I touched them or when I urinated it would burn. Today the swelling is gone but it still burns to pee and the bottom of my vulva is sore at the touch. My discharge is normal, but the smell is horrid. Should I be concerned? I'm 15 and my mother doesn't not know I'm sexually active. Going to a gyno isn't a easy option. Thanks!